A STUDY ON ZIRCON LA-ICP-MS U-PB AND 40AR/39AR AGES OF VOLCANIC ROCKS FROM KENDEKEKE, QIMANTAGE AND THE GEOLOGICAL SIGNIFICANCE
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摘要: 通过对采集到的肯德可克上泥盆统契盖苏群火山岩样品进行锆石LA-ICP-MS U-Pb测年和40Ar/39Ar定年,结合区域地质特征,本文对祁漫塔格构造带的多旋回构造演化进行了总结分析。研究表明,契盖苏群流纹岩形成于晚泥盆世(384.9±6.0 Ma),而契盖苏群的形成时间不晚于晚泥盆世。767±15 Ma、915±18 Ma两个继承性锆石年龄证明研究区响应了Rodinia超大陆聚合—裂解。地层、沉积、变质及变形等证据不支持祁漫塔格地区存在晚古生代洋盆或裂陷槽,晚古生代祁漫塔格地区是发育在柴达木西南缘的陆表海。样品40Ar/39Ar有效坪年龄为220.3±1.7 Ma,代表研究区最后一次埋深达约8000 m。晚三叠世火山活动之后,研究区发生大规模抬升,随后叠加了印支晚期、燕山、喜山等多期构造事件导致中新生代缺少大规模沉降。陆内造山持续到32 Ma左右,随后由于库木库里盆地的伸展,祁漫塔格造山带与东昆仑造山带分离。
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关键词:
- 肯德可克 /
- 火山岩 /
- 锆石U-Pb年龄 /
- Ar40/Ar39年龄 /
- 地质意义
Abstract: Zircon LA-ICP-MS U-Pb dating and 40Ar/39Ar dating were made on the volcanic samples of Qigaisu group from Kendekeke in upper Devonian. Combined with regional geological features, multicyclic tectonic evolution of Qimantag tectonic zone are summarized and analyzed. The results show that, rhyolites in Qigaisu group formed in late Devonian(384.9±6.0 Ma), while Qigaisu group formed no later than late Devonian. The two inherited zircon ages 767±15 Ma and 915±18 Ma certify that the study area responded to supercontinent aggregation-cracking, but evidence from stratum, sedimentation, metamorphism and deformation do not support the existence of the late Paleozoic ocean or aulacogen in Qimantag area, and Qimantag area in late Paleozoic was an epeiric sea located at the southwest margin of Qaidam. The 40Ar/39Ar effective plateau age of the samples is 220.3±1.7 Ma, which shows the latest burial depth is about 8000 m. Large-scale uplift events happened after the late Triassic volcanism, multiphase tectonic events, such as late Indosinian, Yanshanian and Himalayanian, caused the lack of large-scale settlement in Mesozoic and Cenozoic. Intra-continent orogeny lasted to 32 Ma or so. Because of the extension of Kumukuli basin afterwards, Qimantage orogenic belt separated from East Kunlun orogenic belt.-
Key words:
- Kendekeke /
- volcanic rock /
- zircon U-Pb age /
- 40Ar/39Ar age /
- geological significance
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表 1 样品QH-09-83锆石LA-ICPMS U-Pb测年结果表
Table 1. Zircon LA-ICPMS U-Pb dating results of sample QH-09-83
分析点 含量/×10-6 U/Th 同位素比值 年龄/Ma Th U 207Pb/ 206Pb 1σ 207Pb/ 235U 1σ 206Pb/ 238U 1σ 207Pb/ 206Pb 1σ 207Pb/ 235U 1σ 206Pb/ 238U 1σ QH-09-83-01 140.6 180.0 1.28 0.0656 0.0025 0.6052 0.0180 0.0669 0.0014 793 77 481 11 418 9 QH-09-83-02 169.3 199.3 1.18 0.0557 0.0023 0.4843 0.0164 0.0631 0.0014 439 89 401 11 394 8 QH-09-83-03 173.2 311.6 1.80 0.0584 0.0021 0.5077 0.0138 0.0631 0.0013 544 75 417 9 394 8 QH-09-83-04 101.4 350.7 3.46 0.0925 0.0031 1.6114 0.0399 0.1263 0.0026 1478 62 975 16 767 15 QH-09-83-05 410.2 471.7 1.15 0.0607 0.0020 0.5124 0.0127 0.0612 0.0013 628 70 420 8 383 8 QH-09-83-06 277.0 318.2 1.15 0.0605 0.0021 0.4964 0.0131 0.0595 0.0012 622 73 409 9 373 8 QH-09-83-07 175.5 304.9 1.74 0.0558 0.0020 0.4524 0.0129 0.0588 0.0012 443 79 379 9 369 8 QH-09-83-08 139.0 186.4 1.34 0.0763 0.0031 0.6512 0.0213 0.0619 0.0014 1102 78 509 13 387 8 QH-09-83-09 233.6 362.3 1.55 0.0559 0.0019 0.4915 0.0125 0.0637 0.0013 450 74 406 9 398 8 QH-09-83-10 149.6 244.3 1.63 0.0589 0.0021 0.5096 0.0141 0.0628 0.0013 561 76 418 9 393 8 QH-09-83-11 207.1 324.2 1.57 0.0817 0.0028 0.7106 0.0189 0.0631 0.0013 1237 67 545 11 395 8 QH-09-83-12 214.8 351.3 1.64 0.0618 0.0022 0.5399 0.0146 0.0633 0.0013 669 73 438 10 396 8 QH-09-83-13 212.0 256.0 1.21 0.0610 0.0021 0.5292 0.0142 0.0629 0.0013 641 73 431 9 393 8 QH-09-83-14 105.0 163.0 1.55 0.0798 0.0028 0.6822 0.0188 0.0620 0.0013 1192 69 528 11 388 8 QH-09-83-15 265.8 394.6 1.48 0.0542 0.0019 0.4626 0.0122 0.0620 0.0013 377 76 386 8 388 8 QH-09-83-16 110.5 184.9 1.67 0.0582 0.0022 0.4974 0.0146 0.0620 0.0013 538 79 410 10 388 8 QH-09-83-17 279.6 354.1 1.27 0.1292 0.0045 1.1017 0.0295 0.0619 0.0013 2086 60 754 14 387 8 QH-09-83-18 140.9 220.5 1.57 0.0566 0.0021 0.4842 0.0139 0.0621 0.0013 474 79 401 10 388 8 QH-09-83-19 139.6 234.2 1.68 0.0537 0.0021 0.4673 0.0145 0.0631 0.0014 357 84 389 10 395 8 QH-09-83-20 110.5 206.8 1.87 0.0564 0.0024 0.4497 0.0161 0.0578 0.0013 468 92 377 11 362 8 QH-09-83-21 123.0 183.5 1.49 0.0618 0.0025 0.5221 0.0173 0.0613 0.0013 667 83 427 12 383 8 QH-09-83-23 102.9 170.7 1.66 0.0542 0.0022 0.4533 0.0155 0.0607 0.0013 378 89 380 11 380 8 QH-09-83-24 153.3 254.8 1.66 0.0547 0.0020 0.4936 0.0145 0.0654 0.0014 401 80 407 10 408 8 QH-09-83-25 258.5 384.2 1.49 0.0585 0.0021 0.4982 0.0143 0.0618 0.0013 547 77 411 10 387 8 QH-09-83-26 159.2 240.8 1.51 0.0684 0.0024 1.4374 0.0404 0.1524 0.0033 880 72 905 17 915 18 QH-09-83-27 182.2 312.5 1.72 0.0554 0.0022 0.4463 0.0142 0.0584 0.0013 429 84 375 10 366 8 QH-09-83-28 842.7 1052.5 1.25 0.0730 0.0026 0.5386 0.0152 0.0535 0.0011 1015 71 438 10 336 7 QH-09-83-29 332.5 438.4 1.32 0.0550 0.0021 0.4715 0.0143 0.0622 0.0013 412 81 392 10 389 8 QH-09-83-30 288.6 398.1 1.38 0.0550 0.0021 0.4962 0.0150 0.0654 0.0014 412 81 409 10 409 9 表 2 样品QH-09-83钾长石40Ar/39Ar阶段升温分析结果
Table 2. 40Ar/39Ar stepwise incremental heating results of potash feldspar in sample QH-09-83
T/℃ (40Ar/39Ar)m (36Ar/ 39Ar) m (37Ar/ 39Ar) m (38Ar/ 39Ar) m 40Ar/% F 39Ar/×10 -14mol 39Ar(Cum.)/% Age/Ma ±1 s/Ma 700 56.1874 0.1349 0 0.0407 29.02 16.3067 0.37 0.95 245.5 3.1 800 22.208 0.0234 0.0671 0.0172 68.88 15.298 8.99 24.11 231.2 2.2 850 15.8355 0.0031 0 0.0128 94.14 14.9069 6.19 40.07 225.6 2.1 900 15.6058 0.0036 0.0057 0.0131 93.18 14.5409 5.89 55.26 220.4 2.1 950 15.7663 0.0047 0 0.0135 91.13 14.3677 5.01 68.18 218 2.1 1000 16.2629 0.0064 0.0259 0.0141 88.43 14.3816 4.98 81.02 218.2 2.1 1050 16.9776 0.0081 0 0.0144 85.87 14.5794 2.13 86.52 221 2.1 1120 17.0973 0.0085 0.0311 0.0143 85.36 14.5953 2.43 92.79 221.2 2.1 1200 16.1227 0.0047 0.0169 0.014 91.45 14.7438 1.89 97.68 223.3 2.2 1280 17.8253 0.0068 0 0.0141 88.76 15.8225 0.42 98.77 238.6 4.7 1400 55.0893 0.0239 0.8873 0.0234 87.27 48.1131 0.48 100 645.3 5.8 -
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